The Quilpie native, who now lives in Brisbane with her husband Kurt, thought Karen and Ros' baby-themed instant restaurant, inspired by their jobs as midwives, was the perfect time to tell the other teams what only she, her team mate Della Whearty and a few producers knew.

"I've been sitting on this secret for a while now and I just feel like the powers of MKR are staring me in the face and I just feel like I'm going to burst," Sarah said.